Cross-origin resource sharing (CORS) is a mechanism that allows resources to be requested from a domain that's outside the domain from which the request originated. In general, CORS headers are required to enable browser-based HTML5 video players to fetch video and other information from Wowza Streaming Engine™ media server software instance and to allow a website in one domain to request video from a Wowza Streaming Engine server in a different domain. This article describes how to configure CORS settings in Wowza Streaming Engine.
Configure CORS headers
This section shows how to set up CORS for streaming applications in Wowza Streaming Engine Manager. CORS headers are supported by all application types.
- In Wowza Streaming Engine Manager, in the Applications contents panel, select your application, and then click Edit.
- On the application page, select Cross-origin resource sharing (CORS), and then click Save.
Enabling this option turns on a default set of CORS headers that work for all HTTP-based streaming protocols. The CORS headers are enabled for all of the selected HTTP-based Playback Types for the application. To turn on CORS headers for specific HTTP-based streaming protocols, you can manage the Playback Types list in the application settings, or you can configure properties to enable specific HTTP-based streaming protocols to have CORS enabled. You must configure properties to change the CORS header values.
Customize CORS headers with application properties
After you enable CORS headers, you can add the properties to your application. Each CORS property is prefixed with a [protocol], which is either the appropriate protocol name (cupertino or mpegdash) or http to denote all HTTP streaming protocols.
To add any of the above CORS headers properties to a streaming application, do the following:
- In Wowza Streaming Engine Manager, click the Applications tab and then select the name of your application in the contents panel.
- On the application page Properties tab, click Custom in the Quick Links bar.
- In the Custom area, click Edit.
- Click Add Custom Property, specify the property Path, Name, Type, and Value in the Add Custom Property dialog box, and then click Add:
- Click Save, and then restart the application.
Default CORS headers
CORS headers (Main)
- Access-Control-Allow-Origin: *
- Access-Control-Allow-Credentials: true
- Access-Control-Expose-Headers: Date, Server, Content-Type, Content-Length
- Access-Control-Allow-Methods: OPTIONS, GET, POST, HEAD
- Access-Control-Allow-Headers: Content-Type, User-Agent, If-Modified-Since, Cache-Control, Range
CORS headers (Age)
- Access-Control-Max-Age: 60
Customize CORS headers with VHost properties
The default setting is to enable CORS headers for VHost requests that aren't serviced by an HTTP provider or application. You can adjust the default setting by adding the properties shown in the table above to your [install-dir]/VHost.xml file (You must add the properties to the last <Properties> section in VHost.xml using a text editor. Each CORS property is prefixed with a [protocol]. The following example shows a common 'options' request directed at a VHost:
<Property> <Name>optionsCORSHeadersAddMain</Name> <Value>Access-Control-Allow-Headers:X-Authorization</Value> <Type>String</Type> </Property>
Configure CORS headers for HTTP providers
Wowza Streaming Engine has built-in HTTP providers and supports custom HTTP providers that provide additional information to clients. (For more details, see HTTP providers.) By default, the built-in HTTP providers include CORS headers when providing information. You can disable this functionality on a per-provider basis by adding a specific property to the HTTP provider configuration, as shown below:
<HTTPProvider> <BaseClass>com.wowza.wms.http.HTTPServerInfoXML</BaseClass> <RequestFilters>serverinfo*</RequestFilters> <AuthenticationMethod>admin-digest</AuthenticationMethod> <Properties> <Property> <Name>httpCORSHeadersEnabled</Name> <Value>false</Value> <Type>Boolean</Type> </Property> </Properties> </HTTPProvider>